package com.youmu.sichuansfc.util;

import org.apache.log4j.Logger;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * 常用获取客户端信息的工具 
 *  
 */  
public final class NetworkUtil {  

    private static Logger logger = Logger.getLogger(NetworkUtil.class);

    /**
     * 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址;
     *
     * @param request
     * @return
     * @throws IOException
     */
    public final static String getIpAddress(HttpServletRequest request) throws IOException {
        // 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址
        if(request == null )
            return "";
        return request.getHeader("X-Real-IP");
//        String ip = request.getHeader("X-Forwarded-For");
//        if (logger.isInfoEnabled()) {
//            logger.info("getIpAddress(HttpServletRequest) - X-Forwarded-For - String ip=" + ip);
//        }
//
//        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//                ip = request.getHeader("Proxy-Client-IP");
//                if (logger.isInfoEnabled()) {
//                    logger.info("getIpAddress(HttpServletRequest) - Proxy-Client-IP - String ip=" + ip);
//                }
//            }
//            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//                ip = request.getHeader("WL-Proxy-Client-IP");
//                if (logger.isInfoEnabled()) {
//                    logger.info("getIpAddress(HttpServletRequest) - WL-Proxy-Client-IP - String ip=" + ip);
//                }
//            }
//            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//                ip = request.getHeader("HTTP_CLIENT_IP");
//                if (logger.isInfoEnabled()) {
//                    logger.info("getIpAddress(HttpServletRequest) - HTTP_CLIENT_IP - String ip=" + ip);
//                }
//            }
//            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
//                if (logger.isInfoEnabled()) {
//                    logger.info("getIpAddress(HttpServletRequest) - HTTP_X_FORWARDED_FOR - String ip=" + ip);
//                }
//            }
//            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
//                ip = request.getRemoteAddr();
//                if (logger.isInfoEnabled()) {
//                    logger.info("getIpAddress(HttpServletRequest) - getRemoteAddr - String ip=" + ip);
//                }
//                final String[] arr = ip.split(",");
//                for (final String str : arr) {
//                    if (!"unknown".equalsIgnoreCase(str)) {
//                        ip = str;
//                        break;
//                    }
//                }
//            }
//        } else if (ip.length() > 15) {
//            String[] ips = ip.split(",");
//            for (int index = 0; index < ips.length; index++) {
//                String strIp = (String) ips[index];
//                if (!("unknown".equalsIgnoreCase(strIp))) {
//                    ip = strIp;
//                    break;
//                }
//            }
//        }
   //     return ip;
    }
    public static  String getIpAddr(HttpServletRequest request){
        //return  request.getRemoteAddr();
        String ipAddress = request.getHeader("x-forwarded-for");
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){
                //根据网卡取本机配置的IP
                InetAddress inet=null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ipAddress= inet.getHostAddress();
            }
        }
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15
            if(ipAddress.indexOf(",")>0){
                ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));
            }
        }
        return ipAddress;
    }
}  